JP2000239686A - Lubricating liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aqueous lubricating liquid which can be used as a lubricating oil or a hydraulic fluid for operating sections of machines and apparatus, substituting for a conventional oily liquid, and is excellent in terms of environmental protection by incorporating fluoride ions, hydrogencarbonate ions, and a water-soluble alcohol or its derivative into the same. SOLUTION: This lubricating liquid contains fluoride ions, hydrocarbon ions, and a water-soluble alcohol or its derivative as essential ingredients. Preferably, the concentration of fluoride ions is 1×10-3-10 wt.%; and that of hydrocarbon ions, 1×10-2-10 wt.%. The water-soluble alcohol or its derivative is preferably selected from among glycerin, ethylene glycol, and their derivatives and is contained preferably in a concentration of 1-70 wt.% in the liquid. If necessary, the liquid may further contain suitable amounts of a rust preventive, a thickener, a levelling agent, a colorant, a perfume, etc. The liquid covers and protects e.g. the surface of steel by the action of the essential ingredients and reduces the coefficient of friction to reduce the sliding resistance between members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel lubricating liquid that replaces, for example, lubricating oil for machines and devices, hydraulic oil for cylinders, and the like.

[0002]

2. Description of the Related Art Lubricating oil is supplied to a rotating part or a sliding part of a machine or apparatus by a pump or the like so as to reduce resistance caused by rotation or sliding and to prevent seizure of a sliding part. ing. 2. Description of the Related Art Among machine tools, for example, in a machine tool such as a lathe, a milling machine, and a machining center, a cutting oil or the like is caused to flow down to a processing section for various purposes as a work is cut or ground. . As a result, the scattered cutting oil is applied to the bearing portion, the sliding portion of the bed, and the like, and the lubricating oil and the cutting oil are mixed. Therefore, the lubricating oil is collected as a part of the cutting oil and reused, while the lubricating oil is newly replenished.

[0003] Disposal of such cutting oil causes oil treatment problems, and gas volatilized and evaporated from the cutting oil may deteriorate the working environment and impair the health of workers. Cutting fluids are desired and various proposals have been made. However, when an aqueous cutting fluid is used for a machine tool, for example, when the lubricating oil of the machine tool flows into the cutting agent, it appears as an oil film on the surface of the cutting fluid, and finally the lubricating oil is solidified. As a result, since the cutting fluid is circulated and used, there is a fear that the cutting fluid may be adversely affected. Further, when the cutting fluid is discarded, it is necessary to separate the lubricating oil mixed therein, which makes the operation difficult and requires more cost than the oil-based cutting fluid.

[0004] For this reason, if an aqueous lubricating fluid is used in accordance with an aqueous cutting fluid, no problem arises even if the lubricating fluid and the cutting fluid are mixed. The treatment does not cause problems such as separation of oil and water. However, the use of water-based lubricating fluids in machine tools such as expensive machining centers is not limited to the problem of rust, and there is a risk that high-speed rotating drive parts and base parts that receive a large load during cutting will receive large resistance. Not only
Finally, there was a risk of seizure, the danger was high, and there was no aqueous lubricant.

[0005] Hydraulic oil used in an operating device such as a cylinder has been oily than before. This can be explained, for example, by taking a cylinder used in a bulldozer or the like as an example, not only to supply oil to the cylinder to operate the piston, but also to prevent seizure even when a large load is applied. It was important. For this purpose, oil-based hydraulic oil had to be used. In the field of presses and the like, water has conventionally been used as a hydraulic fluid, but no hydraulic fluid has been used between a press and a tank.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an aqueous lubricating fluid or hydraulic fluid in place of an oily liquid which has been used as a lubricating oil or hydraulic fluid for a working part of a machine or device. is there.

[0007]

Means for Solving the Problems Accordingly, the present inventors have
As a result of repeated studies for developing an excellent lubricating liquid having a high lubricating effect and having no problem in waste liquid treatment, the present invention was reached.

[0008] The gist of the lubricating liquid of the present invention resides in that it contains fluoride ions; bicarbonate ions; and water-soluble alcohols or derivatives thereof. Here, the “lubricating fluid” referred to in this specification is a concept that includes a hydraulic fluid that operates a driving device such as a cylinder, in addition to a lubricating fluid that lubricates sliding parts such as mechanical elements.

In such a lubricating liquid, the water-soluble alcohols or derivatives thereof may be glycerin or ethylene glycol.

[0010] Such a lubricating liquid may further contain a rust inhibitor.

[0011]

Next, an embodiment of a lubricating liquid according to the present invention will be described. First, the lubricating liquid of the present invention contains fluoride ions; hydrogen carbonate ions; and water-soluble alcohols or derivatives thereof.

The essential components contained in the lubricating fluid of the present invention are fluoride ions; hydrogen carbonate ions; and water-soluble alcohols or derivatives thereof. The concentration of the fluoride ion and the hydrogen carbonate ion is not particularly limited, but the concentration of the fluoride ion is 1 × 10 ⁻³ wt% to 10 wt%, and the concentration of the hydrogen carbonate ion is 1 × 10 ⁻² wt% to 10 wt% %. Of the water-soluble alcohols and derivatives thereof, preferred are glycerin, ethyl alcohol, methyl alcohol, ethylene glycol and derivatives thereof. Among them, glycerin or ethylene glycol or a derivative thereof is particularly preferred. The concentration of glycerin, ethylene glycol or a derivative thereof in the lubricating liquid is not particularly limited,
Preferably 1% to 70% by weight, more preferably 2% by weight.
% To 60% by weight.

Therefore, the lubricating liquid of the present invention can be prepared by, for example, dissolving predetermined amounts of sodium bicarbonate, sodium fluoride, and ethylene glycol in distilled water, tap water, or mineral water. Not limited. In particular, sodium ions may be replaced by other alkali metal ions or other cations.

The lubricating liquid of the present invention can be used as it is, but may further contain other additives. A typical example of the other additives is a rust preventive, but is not limited thereto, and an appropriate amount of a thickener, a leveling agent, and a coloring agent within a range that does not impair the performance according to actual use conditions. Agents, flavors and the like may be added.

The rust inhibitor used in the present invention may be any commercially available rust inhibitor. For example, ion-coat rust inhibitors, rust inhibitors containing paraffin wax, carnauba wax, etc., and non-amine rust inhibitors are preferably used.
The rust inhibitor is added as needed in accordance with the purpose of use of the lubricating liquid referred to in the present application.

The lubricating liquid of the present invention contains fluoride and hydrogen carbonate ions, water-soluble alcohols or derivatives thereof, and other optional components in water or other water-soluble other components within a suitable concentration range. It is obtained by mixing and dissolving in a solvent.

The present invention relates to a lubricating liquid having the above-mentioned constitution, which protects the surface by coating a steel material or the like by the action of fluoride ions, hydrogen carbonate ions and water-soluble alcohol, and further reduces the friction coefficient. And the sliding resistance of the member is reduced. As a result, when the members are slid, even if the load increases and the surface pressure of both members increases, the contact surface does not seize.

Further, since this lubricating liquid is water-based, for example, when it is used as a lubricating liquid for a machine tool, if an aqueous cutting agent is used, even if the lubricating liquid and the cutting agent are mixed, both are mixed. There is no separation. In particular, since the lubricating liquid of the present invention contains inorganic substances existing in nature, it does not require special waste liquid treatment and does not pollute the water quality of rivers and the like.

The lubricating liquid according to the present invention can be used in a portion which receives either an axial load or a thrust load. Therefore, the lubricating fluid of the present invention can be used in any machine / apparatus of a type that can be used as a lubricating fluid for various machine tools and that supplies the lubricating fluid sequentially using a pump or the like.

Further, the lubricating fluid according to the present invention can be used as a hydraulic fluid in place of conventional hydraulic oil or hydraulic cylinder hydraulic oil or hydraulic water. In particular, since the lubricating fluid of the present invention reduces frictional resistance, it is most suitable as a hydraulic fluid for a heavy-load cylinder such as a power shovel or bulldozer. Needless to say, it can be used as a working fluid for a device for applying a hydraulic pressure.

Examples using the lubricant of the present invention will be shown below, but the present invention is not limited to these examples. The present invention can be implemented in various modified, modified, and modified modes based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

[0022]

(Example 1) 0.8 g of sodium fluoride (manufactured by Arakawa Kagaku Kogyo KK), 3.9 g of sodium hydrogen carbonate (manufactured by Wako Pure Chemical Industries, Ltd.), ethylene glycol (manufactured by Arakawa Kagaku Kogyo KK; specific gravity 1) .1155) 51 ml, glycerin (Arakawa Kagaku Kogyo Co., Ltd.) 1929 ml, rust inhibitor F2 (Kyrest Co., Ltd.) 185 ml, and preservative (Chiyoda Chemical) 1 ml were dissolved in 1 liter of distilled water.
A lubricating liquid (3170 ml (1.169 g / ml)) was prepared.

Using the thus obtained lubricating fluid of the present invention, a durability test of a machine tool was performed. First, the lubricating oil was removed from the driving / sliding portion of the machining center (TV-400-497, manufactured by Mori Seiki Co., Ltd.), and the lubricating oil was removed from the lubricating oil tank. The lubricating liquid of the present invention was put into a lubricating oil tank, and the pump was driven so that the lubricating liquid was sufficiently distributed to various parts such as a bed. After that, the machine was run idle, and it was confirmed that each part moved smoothly. Next, the following processing was repeated. As the cutting agent, a water-based cutting agent having a composition similar to that of the lubricating liquid of the present invention was used.

Material SS400 (300 × 100 × 3
0mm) plate and face mill (SANDVIK)
(CroMill 245, tool diameter: 80.0 mm), and the surface was cut with a cutting margin of 0.5 mm and a finishing margin of 0.2 mm. That is, first, roughing (cutting depth 0.3mm,
Cut width 60.0mm, rotation speed 450rpm, feed speed 2
80mm / min) and finish processing (cutting depth: 0.1
mm, a cutting width of 60.0 mm, a rotation speed of 580 rpm, and a feed speed of 360 mm / min).

In the plate used above, a pilot hole was formed and a hole having an effective depth of 10.0 mm was formed. That is, first, a center drill (manufactured by YAMAWA, CD-E 1.5 × 6
0 °, tool diameter 1.5 mm), a hole was drilled under the following conditions: cycle: drill, rotation speed 2000 rpm, feed rate 200 mm / min, and then a prepared hole drill (manufactured by OSG,
(EX-SUS-GDS 2.6, tool diameter 2.5mm), cycle: high speed, depth of rotation, 3180rpm, feed speed 320mm / min. Drilled holes.

Material AL5052 (300 × 100 ×
30mm) plate and end mill (OSG, V-
The surface was cut with an allowance of 0.2 mm and a finish allowance of 0.2 mm using XPM-EMS 20, tool diameter 20.0 mm).
That is, first, rough machining (cut depth 0.0 mm, cut width 10.0 mm, rotation speed 1240 rpm, feed speed 350 mm
/ Min), and then finish processing (cut depth: 0.1 mm, cut width 10.0 mm, rotation speed 1610 rpm, feed rate 4)
50 mm / min).

Material SUS304) (300 × 100
× 30mm) plate and end mill (OSG, V
-XPM-EMS 20, tool diameter 20.0 mm)
The surface was cut with a removal allowance of 0.2 mm and a finish allowance of 0.2 mm. That is, first, roughing (cut depth 0.0 mm, cut width 6.0 mm, rotation speed 300 rpm, feed rate 60 mm /
Min), and finish processing (cut depth: 0.1 mm, cut width 6.0 mm, rotation speed 390 rpm, feed speed 80 mm /
Minutes).

[0028] After drilling a hole having a prepared hole shape and a prepared hole depth of 7.0 mm in the plate used above, chamfering (type:
(Metric, chamfer amount: 0.3 mm), and a female screw (nominal diameter: 3.0 mm, pitch: 0.5 mm) was cut into the hole. That is, first, a center drill (Yamawa, C
DE 1.5 × 60 °, tool diameter 1.5 mm), cycle: drill, rotation speed 1400 rpm, feed rate 16
After drilling a hole under the condition of 0 mm / min, the hole is subsequently drilled using a pilot hole drill (manufactured by OSG, EX-SUS-GDS 2.6, tool diameter 2.5 mm). 191
A hole was drilled under the conditions of 0 rpm and a feed rate of 130 mm / min.
After that, chamfering drill (OSG, TIN-NC-L
DS 6 × 90 °), and chamfering was performed under the following conditions: cycle: drill D, rotation speed 2670 rpm, feed speed 160 mm / min. Next, tap (EX-SUS-S made by OSG)
FT m3 × 0.5, tool diameter 3.0mm), cycle: synchronization, rotation speed 1170rpm, feed rate 0.5mm
The internal thread was cut under the condition of / min. Repeat the above operation,
A total of 7 × 27 189 internal threads were formed.

The above operations are repeatedly performed.
When the machine for exchanging the workpiece was stopped, it was checked as to whether any abnormality occurred in each part of the machining center. No abnormalities were found in the operation test for a total of 800 hours (actual results up to the day before the application). During this operation experiment, the lubricant was replenished, but neither the lubricant tank nor the cutting fluid tank was abnormal.
No abnormality was found in the machining center.

Example 2 Using a centrifugal pump (EC40 = 28 manufactured by Nishijima Seisakusho), the bearing was filled with the lubricating liquid obtained above. Then, continuous operation was performed day and night, and an operation experiment was performed for a total of 2472 hours (actual results up to the day before the application). During that time, the operation was exactly the same as at the start of operation, and no abnormality was found.

Example 3 Mini excavator machine (manufactured by Komatsu Ltd., manufactured on December 15, 1985, model P)
C-20,5), and the obtained lubricating liquid was filled in place of the hydraulic oil supplied to the power shovel and direction changing cylinders. In addition, operation involving movement and change of direction between the tarmac and the work site, and drilling work
An operation test was conducted for 05 hours (actual results up to the day before the application), during which time the operation was exactly the same as at the start of operation, and no abnormality was found. In addition, during the operation test period, after leaving for 10 hours or more in the environment where the outside air temperature was −6 ° C. or less, the engine was immediately operated to move with a change of direction, and the power shovel was operated. Was also not found.

[0032]

The lubricating liquid of the present invention has a high lubricating effect and a low viscosity, so that the frictional sliding resistance is reduced and no seizure occurs.

Since the lubricating liquid of the present invention does not contain a component that emits a bad smell as a volatile / evaporating component or a component that pollutes the environment, it is excellent in workability and environmental performance. In addition, since it does not contain substances that adversely affect the environment, no special wastewater treatment is required even when treating as waste liquid. Furthermore, since the lubricating fluid of the present invention is aqueous, an aqueous cutting agent can be used, and the synergistic effect is excellent in workability and environmental friendliness.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10M 125: 00) C10N 10:02 30:12 40:08 50:02 (72) Inventor Yukio Wada Shiga 2374 Takamiyacho, Hikone City (72) Inventor Eiichiro Nakayama 1700, Idemachi, Hikane-shi, Shiga Prefecture B Building No. 102 (72) Inventor Shoji Futsubashi 1-54, Saimachi, Yokaichi-shi, Shiga Prefecture (72) Inventor Shunji Suzuki Mie 1-225 Horiko 1-2, Horiki, Yokkaichi City, Prefecture (72) Inventor Chiyo Wada 1-26, Higashiimasakicho, Yokaichi City, Shiga Prefecture (72) Inventor Naomi Kitagawa 117-6, Horimachi, Hikone City, Shiga Prefecture (72) Inventor Mie Fukutani 257-1 Ina, Notogawa-cho, Kanzaki-gun, Shiga Prefecture (72) Inventor Kosuke Wada 2374, Takamiya-cho, Hikone-shi, Shiga Prefecture (72) Inventor Shinya Fukushima 1007, Katsu-cho, Kotocho, Aichi-gun, Shiga Prefecture (72) Inventor Yoshihiro Fukuya Osaka Osaka Prefecture 22-4 Tageshima (72) Inventor Sadayuki Nihashi 1-3-3 Kanaya, Yokaichi, Shiga Prefecture (72) Inventor Yuko Okamoto Hatsune Oyamashita 14, Kita-ku, Kyoto-shi, Kyoto (72) Inventor Kazuma Suzuki 5-3-9 Okusawa, Setagaya-ku, Tokyo (72) Inventor Takako Fukuya 25-7 Iba, Notogawa-cho, Kanzaki-gun, Shiga Prefecture (72) Inventor Sadao Nihashi 1-3-3 Kanaya, Yokaichi-shi, Shiga Prefecture (72) Invention Person Tamiko Tsuruta 2F No.5 Marushima Building, 2-10 Kanojincho, Gifu City, Gifu Prefecture 4F104 AA01A AA13C AA16C BB02C BB04C EA17C EB10 FA01 FA02 LA01 LA03 LA20 PA05 QA05

Claims (3)

[Claims] 1. A lubricating liquid comprising: a fluoride ion; a hydrogen carbonate ion; and a water-soluble alcohol or a derivative thereof. 2. The lubricating fluid according to claim 1, wherein the water-soluble alcohol or a derivative thereof is glycerin or ethylene glycol. 3. The lubricating liquid according to claim 1, further comprising a rust preventive.